Carla/source/modules/lilv/lilv-0.24.0/src/lib.c

/*
  Copyright 2012-2016 David Robillard <http://drobilla.net>

  Permission to use, copy, modify, and/or distribute this software for any
  purpose with or without fee is hereby granted, provided that the above
  copyright notice and this permission notice appear in all copies.

  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

#include "lilv_internal.h"

LilvLib*
lilv_lib_open(LilvWorld*               world,
              const LilvNode*          uri,
              const char*              bundle_path,
              const LV2_Feature*const* features)
{
	ZixTreeIter*  i   = NULL;
	const LilvLib key = {
		world, (LilvNode*)uri, (char*)bundle_path, NULL, NULL, NULL, 0
	};
	if (!zix_tree_find(world->libs, &key, &i)) {
		LilvLib* llib = (LilvLib*)zix_tree_get(i);
		++llib->refs;
		return llib;
	}

	const char* const lib_uri  = lilv_node_as_uri(uri);
	char* const       lib_path = lilv_file_uri_parse(lib_uri, NULL);
	if (!lib_path) {
		return NULL;
	}

	dlerror();
	void* lib = dlopen(lib_path, RTLD_NOW);
	if (!lib) {
		LILV_ERRORF("Failed to open library %s (%s)\n", lib_path, dlerror());
		lilv_free(lib_path);
		return NULL;
	}

	LV2_Descriptor_Function df = (LV2_Descriptor_Function)
		lilv_dlfunc(lib, "lv2_descriptor");

	LV2_Lib_Descriptor_Function ldf = (LV2_Lib_Descriptor_Function)
		lilv_dlfunc(lib, "lv2_lib_descriptor");

	const LV2_Lib_Descriptor* desc = NULL;
	if (ldf) {
		desc = ldf(bundle_path, features);
		if (!desc) {
			LILV_ERRORF("Call to %s:lv2_lib_descriptor failed\n", lib_path);
			dlclose(lib);
			lilv_free(lib_path);
			return NULL;
		}
	} else if (!df) {
		LILV_ERRORF("No `lv2_descriptor' or `lv2_lib_descriptor' in %s\n",
		            lib_path);
		dlclose(lib);
		lilv_free(lib_path);
		return NULL;
	}
	lilv_free(lib_path);

	LilvLib* llib = (LilvLib*)malloc(sizeof(LilvLib));
	llib->world          = world;
	llib->uri            = lilv_node_duplicate(uri);
	llib->bundle_path    = lilv_strdup(bundle_path);
	llib->lib            = lib;
	llib->lv2_descriptor = df;
	llib->desc           = desc;
	llib->refs           = 1;

	zix_tree_insert(world->libs, llib, NULL);
	return llib;
}

const LV2_Descriptor*
lilv_lib_get_plugin(LilvLib* lib, uint32_t index)
{
	if (lib->lv2_descriptor) {
		return lib->lv2_descriptor(index);
	} else if (lib->desc) {
		return lib->desc->get_plugin(lib->desc->handle, index);
	}
	return NULL;
}

void
lilv_lib_close(LilvLib* lib)
{
	if (--lib->refs == 0) {
		dlclose(lib->lib);

		ZixTreeIter* i = NULL;
		if (lib->world->libs && !zix_tree_find(lib->world->libs, lib, &i)) {
			zix_tree_remove(lib->world->libs, i);
		}

		lilv_node_free(lib->uri);
		free(lib->bundle_path);
		free(lib);
	}
}